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The ICARUS-T600 detector is a 760-ton Liquid Argon Time Projection Chamber(LArTPC) currently operating at Fermilab as the Far Detector in the ShortBaseline Neutrino (SBN) program. The SBN program is composed of three LArTPCswith a central goal of testing the sterile neutrino hypothesis. After operatingfor 3-years in the Gran Sasso Underground Laboratory, the ICARUS detector wasshipped to CERN where it was outfitted with 360 8" Photomultiplier Tubes (PMTs)for a new optical detection system. The PMT system detects fast scintillationlight from charged particles interacting in the Liquid Argon, generating thetrigger signal for the full detector and allows 3D reconstruction of events.Now operating at shallow depth, the detector is exposed to a high flux ofcosmic rays that can fake neutrino interactions. To mitigate this effect aCosmic Ray Tagger (CRT) and a 3-meter-thick concrete were installed. Precisetiming information from both the PMT and CRT subsystems can help to identifywhether an interaction originated from inside or outside of the ICARUScryostat. This paper reviews a method for cosmogenic background reduction andtiming calibration of the CRT and PMT light detection systems in ICARUS.

Light detection and Cosmic Rejection in the ICARUS LArTPC at Fermilab